Hypodermic syringe



June 9,1936. M, w, K TZ 2,043,832

HYPODERMIC SYRINGE Filed June' 28, 1934 INVENTQR e ATT NEY Mbmvzz"(l/K1772,

Patented June 9, 1936 UNETED STATES PATENT orFics HYPODERMIC SYRINGEMichael W. Kratz, Philadelphia, Pa.

Application June 28, 1934, Serial No. 732,858 4 Claims. (01. 128-215) Myinvention relates to a new and useful hypodermic syringeand it relatesmore particularly to a hypodermic syringe in which a removablepre-filled and sealed ampoule containing the ,5. liquid to be injectedforms part of the operative structure and in which the sterilization aswell as the assembly of the permanent metallic parts of the syringe withthe ampoule is greatly expedited and facilitated.

10 My invention still further relates to a hypodermic syringe of thischaracter which is of an extremely simple, light and durableconstruction and which is very easy of operation and manipulation.

15 My invention still further relates to a syringe of this character inwhich the ampoule, containing the liquid to be injected, and which isusually made of glass, is not subjected to any mechanical stress orstrain during the injection of the liquid contained therein, thussafeguarding against breakage of the glass ampoule during themanipulation of the syringe.

My invention still further relates to a syringe of this character whichis adapted yieldably, but

1 nevertheless firmly, to engage the ampoule so as 25 to compensate forsmall inequalities which may occur in the manufacture 'of the glassampoules.

My invention still further relates to a syringe of this character, theampoule forming part of 1 which is provided with a stopper adapted toact 30 as a piston at one end thereof and the other end .of which isslightly crimped to prevent exit of the stopper in this end of theampoule under pressure of the liquid during injection.

My invention still further relates to a syringe of this charactercomprising means for effecting positive engagement of the piston rod ofthe syringe with the stopper adapted to serve as the piston, as well asmeans for'exerting the pressure necessary to eject the contents of theampoule without producing any pressure on the glass ampoule proper orupon the part of the body into which ejection is made. I

In the accompanying drawing:

Fig. 1 represents a fragmentary view in side elevation of a syringeembodying my invention, illustrating the method of' inserting adetachable ampoule. 7

Fig. 2 represents a view in side elevation at right angles to Fig-. -1showing the complete 50 syringe ready for use.

Fig. 3 represents a view at right angles to Fig. 2, partly in sectionand partly in elevation, showing details of construction.

55 Fig. 4 represents a plan view of the cap engaging the bottom end ofthe ampoule and shown in Figs. 2 and 3.

Fig. 5 represents a vertical sectional view on line 55 of Fig. 4.

Fig. 6 represents a section on line G6 of Fig. 1. 5

Fig. '7 represents .a fragmentary sectional view, on an enlarged scale,showing details of construction.

Fig. 8 represents a side elevation of the ampoule forming part of myinvention, certain parts being shown in section.

Fig. 9 represents a view similar to Fig. '6, with the piston inregistration with the ampoule and ready for use.

Fig. 10 represents a vertical sectional view of a modified form of thebottom cap shown in Figs.

4 and 5.

Fig. 11 represents a view in side elevation, on an enlarged scale, of astop formingpart of the needle assembly and shown in Figs. 2, 3, and 5.

Referring to the drawing in which like reference characters indicatelike parts, my novel syringe comprises a yoke I, the limbs of which areprovided with grooves 2 which are slidably adapted to engagethe edges 3of the finger piece 4. The movement of the yoke l longitudinally of thefinger piece 4 is limited by the shoulders 5. The finger piece 4 carriesthe pendant sleeve 1 which is adapted to receive and retain the ampoule8 which contains the liquid to be injected. Ihe sleeve 1 is split as at9 to give it a certain amount of resiliency and to enable it firmly andyieldably to engage the ampoule 8 and to compensate for slightvariations or irregularities in the dimensions of the ampoule 8. Theampoule 8 is provided with the upper flange [0 which rests upon theupper edge or rim ll of the finger piece 4, as best seen in Figs. 3 and7.- Sliding through theyoke I is a piston rod H which has the upperthumb or pressure piece l3 and the 40 bottom head l4 which carries a pinor the'like I5 adapted toengage the rubber or other stopper [6 in theupper end of the ampoule, in the manner best shown in Fig. 3. In thebottom end of the ampoule 8 is another stopper of rubber or othermaterial 18 and the bottom end of the ampoule 8 is crimped or restrictedas at I9 to prevent exit of the stopper l8 when it is subjected topressure while the syringe is in use. Engaging the bottom end of theampoule 8 isa cap 20 which is split 0 as at 2 I, firmly and resilientlyto engage the ampoule 8 and to compensate for slight variations orirregularities in the size or contour of the ampoule. The cap 20 isprovided with an aperture to permit insertion of the cannula 23 of thehypo- 5 dermic needle 24 and is further provided with a 7 seat 26adapted to accommodate the detent 21 carried by the needle 24.. 29represents a stop, best shown in Fig. 11, which is slid over the por- Vtion of the needle protruding through the cap 20,

and which aids'in holding the needle in position. In Fig. 1 have shown amodified form'of the 7 cap 23, which except in certain features ofconstruction serves the same purpose and possesses '1 the sameadvantages as those'described in con- V nection with the cap best shownin Fig.5. 7

When it is desired to use the hypodermic syringe embodying my invention,the yoke! is moved longitudinally ofthe finger pieced to theposi- 1tionshown in Figs. 1 and 6. This takes the piston rod out of alignmentor registration with i the sleeve 1 and permits insertion of the ampoule8. After the ampoule B has been inserted in the position shown in Figs.2 and 3 the yoke l is moved longitudinally of the finger piece into theposition shown in' Figs'. 2, 3, and 9 to bring the piston rod I 2 inregistration with the ampoule.

7 Pressure upon the thumb'piece 13 will force the pin l5 at the bottomof the piston rod IZ into thej'stop I 6 in the upper end of theampoule'fl, firmly "to engage the piston rod l2 with the stopperlfirwhich underpressure will act as a piston with the ampoule 8 as thecylinder. The

needle 24' is then applied to the cap (of either of t 0 theforms shown)in the manner shownjin Fig. 5

and the cap is then pulled over the bottom end V -'of'the'am'p'ou1e 8..This forces'the upper cannula 23 of the needle 24 to penetrate thestopper l8 in the lower end of the ampoule in the manner '5 best "seenin'Fig. 3'. :The syringe is now ready for use, and with the fingersengaging the finger piece 4 and .the thumb or the palm of the hand'exerting pressure on' thepressure piece I3 the upper: stopper I6 is.pushed towards the fixed stopper l8 which is retained within the ampouleby the crimped or restrictedbottom end I9 and acts as a piston to forcethe liquid contained within the ampoule out through the needle which hasalready been inserted under the skin or into 14 the vein, as the casemay be. It will benoticed that'the ampoule 8 is not 'subjectedfto anymaterial pressure against unyielding metallic sur-' faces and thattheronly pressure to which the ampoule is subjected is the pressurebetween'the flange l0 thereof and the rim ll of the upper sleeve 1.while pressure is being; applied on the upper piston-like stopper l6.Due to the distribution' of. the pressure'over the entire flange 10, therisk of anybreakage is completely elimi hated. Due to the lack of anyrigid connection;

' between the upper sleeve! and the bottom cap 20,

the thin walls of the ampoule, as well as the relatively fragile lowerend thereof, are not subjected to any pressure during the injectingoper- V 7 0 ation. J 1

Iclaim: V I f 1. In a hypodermicfsyringe of the character stated, afinger piece, a sleeve carried thereby and adapted tosupport an ampoulecontaining the 5 liquid to be injected; a'yoke slidable longitudi-,nally of said finger piece, means for limiting the movement of saidyoke, a piston rod slidable through said'yoke, means on the bottom end:of

7 said piston rod for engaging a'stopper in the 70 upper end of anampoule carried by said sleeve,

stated, a finger piece, a split resilient sleeve ported by said sleeve,a split resilient separate cap adapted to engage the bottom end of saida separate cap adapted to engage the bottom end of said ampoule, ahollowneedle carried by said cap and having itslower end protrudingthrough thebottom of said cap and its upper end extending upwardly within said cap,whereby the upper end of said needle is adapted to penetrate a Tstopperin the lower end of said ampoule to permit ejection of the liquidcontained in said ampoule through said needle when pressure is appliedby means of the piston rod on the stopper in the upper end of saidampoule, the bottom end of said ampoule being restricted to prevent exitof said lower stopper. i

2, In a hypodermic syringe of the character pendant therefrom andadapted to receive and; support a removable ampoule containing theliquid to' be injected, a yoke having grooves.

therein permanently engaging the edges of 'said fingerpiece and slidablelongitudinally thereof, means'for limiting the movement of said yoke, apiston 'rod slidable through said yoke, means on the bottom of saidpiston-rod for engaging a stopper in the upper end of the ampoulesupampoule, a hollow needle carried by said cap and having its lower endprotruding through the bot- 7 tom of saidrcap and its upper endextending upwardly'within'said cap,'there being a detent on 0 saidneedle engaging a seat in said cap, whereby the upper end of said needleis adapted to penetrate a stopper in the lower end of said ampoule topermit ejection of the liquid contained in said ampoule through saidneedle when pressure ,is 5 applied by means of the piston rod on thestopper in the upper. end of said ampoule, the bottom end of saidampoule being restricted to prevent exit 7 of said lower stopper; 7 I

3. The combination of a hypodermic syringe, 40

comprising afinger piece, a sleevecarried thereby, a yoke slidablelongitudinally of said finger piece, means for limiting. the movement ofsaid yoke; a piston rod slidable through said yoke, a

separate bottom cap, a hollow needle having the lower end thereofprotruding through said cap and the upper end thereof extendingupwardly" through said cap, there being adetent on said needle engaginga seat in saidcap', of an ampoule containing the liquid to be injectedand adapted 5 to be inserted throughsaidsleeve, said ampoule 7 having anupper flange adapted to engage and adapted'to support an ampoulecontaining the liquid to be injected, a yoke slidable longitudinally 5of said finger piece, a piston rod carried by and movable through saidyoke, and means forlimiting the movement of said yoke with respect to'said finger piece.

MICHAEL w. KRATZ. 7o

